Electro cleaning of stainless steel

[KemppiFrog]

While I am here... Does phosphoric acid come as a liquid or powder. If powder, is it also on the bay?

Got un-lazy and looked. So liquid..

 

[Seadog]

https://www.ebay.co.uk/itm/Phosphor...cale-Remover-Max-Stength-85-industrial-5Litre

 

[Anguz]

my brush turned up today.....
anyone got a link as to how i wire it up ??
phos acid isnt a problem
have worked out i need 24ish volt dc
does polarity matter ?
current required ?

 

[KemppiFrog]

Somewhere up the thread it said brush -ve. I await confirmation....

 

[Paul.]

yes brush negative, the bristles are conductive so arrange for something non conductive to place it on or in when you put it down to save shorting out the power supply and damaging the brush,

 

[Anguz]

Bulb in series to limit current ?

 

[KemppiFrog]

Bulb in series to limit current ?

Why? One needs a bit of current.

 

[Richard.]

About 5amps works I’ve read

 

[KemppiFrog]

yes brush negative, the bristles are conductive so arrange for something non conductive to place it on or in when you put it down to save shorting out the power supply and damaging the brush,

Paul, Is not brushing effectively shorting out the current? Or do you mean leaving it for a while in static 'contact' as opposed to moving around during brushing.
Learning curve for me here.

 

[KemppiFrog]

About 5amps works I’ve read

Ah, my transformer says 3 amps at 20.5 v, so worth a try.

 

[Richard.]

Paul, Is not brushing effectively shorting out the current? Or do you mean leaving it for a while in static 'contact' as opposed to moving around during brushing.
Learning curve for me here.

It is but your keeping the bristles wet in use with the acid which prevents damaging them. What Paul is saying don’t put it down on the job in dead short. It’s not good for it just to hold it on dead short. Things will get hot. It’s gets hot in use.

 

[Richard.]

Ah, my transformer says 3 amps at 20.5 v, so worth a try.

Probably spot on. My charger puts out 12-22v At 4 amps. I doubt small variations will make any difference.

 

[KemppiFrog]

It is but your keeping the bristles wet in use with the acid which prevents damaging them. What Paul is saying don’t put it down on the job in dead short. It’s not good for it just to hold it on dead short. Things will get hot. It’s gets hot in use.

Thanks.
KF
+ 1 for last post..

 

[outofthefire]

I wonder if wire wool would work in place of the brush? It's a bit more disposable than a brush.

 

[Richard.]

I wonder if wire wool would work in place of the brush? It's a bit more disposable than a brush.

I think some wire wools contain steel among other metals. I’d guess it’s probably not the best to pasivate stainless with due to possibly contamination. Not 100% sure tbh.

 

[Anguz]

I was quite surprised how small the eBay brush is

 

[Richard.]

I was quite surprised how small the eBay brush is

Yeah it’s only little. I’d sleeve the copper handle if I was you. I put some rubber pipe over mine. Just saves accidents happening and it does get quite warm if you do a bit.

 

[Hood]

Due to a conversation in another thread I have decided to try and get a unit made up.
Any idea if this would be a suitable power source or is it a bit overkill?

I may have some lower current ones, still transformer based, would they be a better option?

 

[gordon stephenson]

Would it be possible to make a brush from a piece of welding cable, with the strands splayed out to form the bristles?

 

[Maker]

Would it be possible to make a brush from a piece of welding cable, with the strands splayed out to form the bristles?

Same problem as using a wire brush as in post 35 I reckon, can't hurt to try it though.